This easy-to-use Honeywell thermostat has an intuitive interface to make programming and day-to-day use simple. After all, being comfortable should be easy. Features include: Pre-installed lead wires make installation quick, safe and simple The back-lit display makes viewing the screen easy in any light Four buttons allow for simple manual control of system operations, including fan speed and temperature adjustment Digital display of ambient temperature, setpoint, heating or cooling mode, fan status and remote setback Proportional plus integral (P+I) control algorithm for precision temperature regulation, ensuring consistent comfort throughout your residence Single setpoint and heat/cool setpoint methods for 4-pipe auto changeover Adjustable maximum heating and minimum cooling setpoint limits using range stops ensures your residence never becomes too hot or too cold EEPROM permanently retains user settings, including setpoints, during power loss and no batteries are required! Selectable Celsius or Fahrenheit display via Setup button on thermostat Displayable pipe-sensor temperature readout helps with troubleshooting issues Selectable to allow the fan motor to always begin on high speed to ensure sufficient torque at startup Option to wire a remote indoor temperature sensor Freeze protect algorithm turns on heat when needed Economy setback options via dry contact or Activity Sensing